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While reading the Tuning Derby manual, I was surprised to find out that Derby won't use an
available ascending-order index to do a descending-order ORDER BY:
Think about index order:
Derby allows you to create index columns in descending order in addition
to creating them in ascending order, the default. Descending indexes
provide performance benefits for the following kinds of queries that
require sorting data in descending order. To ensure performance benefits,
verify that the descending index is being used. See Analyzing statement
execution for information on how to do this.
I now know why some of my queries are slow, which is a good thing. But it looks like I may
have to add a second index in order to make the application able to present results ordered
in either direction.
I couldn't find an open JIRA entry for enhancing Derby to make using of opposite-ordered indexes
when doing ORDER BY. Did I miss an existing one, should I add a new one, or is this impossible
for some reason?